'IIII.KS AND ABSTRACTS OF rAPERS 113 



to lie iilKive the inarino plane jukI show discordaiu-es such as would be ex- 

 [»ecte(l in drift-hk^eUed river valleys. I'rofiles of some of the State highw^ays 

 bring out this feature. 



Facts collected in the Merrimac and Connecticut valleys are considered in 

 relation to the foregoing data, together with data secured by the writer in the 

 provinces of Quebec. New Brunswick, Nova Scotia, and elsewhere, between 

 li»(H5 and 1910, and an attempt is made to determine by means of isobases the 

 probable amount of uplift of the interior of New Hampshire since the Glacial 

 period. 



Presented without maiiiisoript, with the aid of a map. 



Discussion 



Trof. C. W. Brown : A great contrast exists between the number, magnitude, 

 and size of pebbles or boulders of modern beaches and those of the two w^ell 

 marked stratified clay sea-deposits at 91 feet on Mount Desert Island, Maine, 

 and the well defined cliff and fine gravel offshore beach at 210 feet elevation. 

 These great differences indicate either less continuous wave action or more 

 offshore protection at the time of the formation of the high level beaches. 



Kemarks were also made by Prof. E. A. Dal3^ 



The Society adjourned for luncheon about 12.30 o'clock and recon- 

 vened at 2.10 p. m., with President Merriam in the chair. 



TITLES AND ABSTRACTS OF PAPERS PRESENTED BEFORE THE AFTERNOON 

 SESSION AND DISCUSSIONS THEREON 



FEATCRES OF THE f^HIFTS OF LAND AND SEA-LEVEL JN THE ATLANTIC AND 



GULF COASTAL PLAIN DURING PLEISTOCENE AND 



POST-PLEISTOCENE TIME 



BY THOMAS WAYLAND VAUGHAN 



iAhstract) 



This paper described some of the features of the fluvial and coastal marine 

 terraces of the Coastal IMain, with particular reference to earth-movement 

 and eustatic shift of scale vel. 



Kead from manuscript. 



Discussion 



Dr. W. T. Lee: In eastern Virginia there is one conspicuous wave-formed 

 terrace lying at the foot of a sea-facing scarp. This terrace is approximately 

 !'(► feet above sealevel and is composed of horizontally bedded sand and clay. 

 Beds of oyster shells in these strata indicate that sealevel was once about 20 

 feet liigher than now, with reference to the land. In the same region peat 

 b<'<ls indicating cypress swamps are peiu-trated by wells at least as low as 00 

 U'i-t below sealevel. A tempting explanation is oseillation <»f sealevel. 



Remarks were also made by Prof. P. A. Maly. 



VIII— BtKL. GroL. Sor. A.M.. V<ir,. .il. 1910 



